New study shows the Republican health care bill would leave up to 18 million more without insurance by 2019

The latest push by Republican to repeal and replace Obamacare would leave millions more without health insurance and likely cause costs to rise for Americans in the individual insurance market, according to a study published Wednesday.

The Graham-Cassidy-Heller-Johnson (GCHJ) legislation would change the way the federal government spends billions of dollars in federal healthcare funding. The shift would likely produce massive effects on the coverage and cost of Americans' health insurance.

The left-leaning Commonwealth Fund on Wednesday released an analysis of the GCHJ plan by using previous CBO scores for similar bills and other studies.

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Protests against the Republican health care bill

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Protests against the Republican health care bill

THE PARK IMPERIAL AT 230 WEST 56TH ST , NEW YORK, UNITED STATES - 2017/07/10: New Yorkers and healthcare advocacy groups organized a protest on July 10, 2017; outside Rep. John Faso's fundraiser as donors arrive at the Park Imperial at 230 West 56th St. in Midtown Manhattan. Faso voted for the House Trumpcare bill in May, he also coauthored the notorious Collins-Faso amendment to both the House and Senate bills that would shift New York Medicaid funding from counties budgets to the state budget. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)

Healthcare activists get a police warning during a protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas

WASHINGTON, DC - JULY 10: A demonstrater from Arizona chants, 'Kill the bill or lose your job' while sitting on the floor outside the offices of Sen. Jeff Flake (R-AZ) during a protest against health care reform legislation in the Russell Senate Office Building on Capitol Hill July 10, 2017 in Washington, DC. More than 100 people from across the country were arrested during the protest that was organized by Housing Works and Center for Popular Democracy. (Photo by Chip Somodevilla/Getty Images)

NEW YORK COUNTY REPUBLICAN OFFICE, NEW YORK, UNITED STATES - 2017/07/05: The Socialist Feminists of Democratic Socialists of America (DSA) organized a protest outside of the New York County Republican Office in New York City on July 5, 2017; to tell Republicans that is it despicable and undemocratic that they are trying to ram Trumpcare through the Senate without debate or public hearings. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)

UNITED STATES - JULY 10: Health care protesters from Arkansas chant outside of the office of Sen. John Boozman, R-Ark., in the Hart Senate Office Building on Monday, July 10, 2017. About a dozen people loudly voiced opposition to the GOP health care bill. (Photo By Bill Clark/CQ Roll Call)

THE PARK IMPERIAL AT 230 WEST 56TH ST , NEW YORK, UNITED STATES - 2017/07/10: New Yorkers and healthcare advocacy groups organized a protest on July 10, 2017; outside Rep. John Faso's fundraiser as donors arrive at the Park Imperial at 230 West 56th St. in Midtown Manhattan. Faso voted for the House Trumpcare bill in May, he also coauthored the notorious Collins-Faso amendment to both the House and Senate bills that would shift New York Medicaid funding from counties budgets to the state budget. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)

NEW YORK, NY - JULY 5: A small group of activists rally against the GOP health care plan outside of the Metropolitan Republican Club, July 5, 2017 in New York City. Republicans in the Senate will resume work on the bill next week when Congress returns to Washington after a holiday recess. (Photo by Drew Angerer/Getty Images)

A small group of activists rally against the GOP health care plan outside of the Metropolitan Republican Club, July 5, 2017 in New York City. Republicans in the Senate will resume work on the bill next week when Congress returns to Washington after a holiday recess. (Photo by Zach D Roberts/NurPhoto via Getty Images)

Healthcare activists are detained after a protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas

A staff members asks the media to leave the room as Healthcare activists protest in the office of Senator Jeff Flake (R-AZ) to stop the Republican health care bill at Russell Senate Office building on Capitol Hill in Washington, U.S., July 10, 2017. REUTERS/Yuri Gripas

U.S. Capitol police arrest demonstrators in wheelchairs protesting against the AHCA health care bill put forward by President Trump and Congressional Republicans as several dozen protestors are taken into custody after refusing to leave the rotunda of the U.S. Capitol in Washington, U.S., March 22, 2017. REUTERS/Jim Bourg

Demonstrators hold signs during a protest against the repeal of the Affordable Care Act outside the Capitol Building in Washington, U.S., March 22, 2017. REUTERS/Aaron P. Bernstein

Healthcare activists are detained after a protest to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas

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Here are the major findings from Commonwealth's Sara Collins:

15-18 million more uninsured in 2019: The bill's repeal of the individual mandate, which compels people to sign up for insurance, would have immediate effects when it goes into place in 2019. Based on previous CBO scores of similar provisions, the jump in the number of people without insurance compared to the current system would be as high as 18 million in the first year.

32 million more people uninsured after 2026: The bill also would shift funding for Obamacare's Medicaid expansion and individual insurance market subsidies into a lump sum given to states every year. The bill, however, simply cuts off those grants after 2026. Commonwealth said the roughly 32 million people projected to be beneficiaries of these programs would simply be cut off after that date.

Significantly higher premiums: Commonwealth also said previous CBO breakdowns of a mandate repeal showed premiums increases of 15% to 20% in the first year. "The majority of that increase would come from the repeal of the mandate penalties: insurers would expect that those who remained in the pool would be the least healthy," Collins wrote.

Undercut protections for people with preexisting conditions: States could apply for waivers to relax some of Obamacare's regulations if it brings down costs. While the bill does say the state has to continue to provide "adequate and affordable" coverage for people with preexisting conditions, Commonwealth said the leeway for the waivers could lead to the elimination of Obamacare's protections for these people. "It would allow states to apply for waivers that would let insurers charge people with health problems higher premiums, and change other ACA consumer protections such as bans on lifetime benefit limits and comprehensive coverage requirements," Commonwealth said.